$base:#efefef;

body{
    background: $base;
}
li{
  list-style: none;
}
.mask {
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    position: absolute;
    z-index: 1;
    top: 0px;
    left: 0px;
    display: flex;
    justify-content: center;
    align-items: center;
    .dialog {
      width: 200px;
      height: 200px;
      background: white;
      border-radius: 8px;
    }
  }